A man shot at a Mid-City apartment complex after a woman said he barged into her apartment was actually wounded in an exterior hallway when he mistakenly arrived on the wrong floor of a family member's building for a Labor Day visit, according to a relative and New Orleans police.

The apartment's resident, Martynenez Grigsby, told authorities she fired on an intruder. But she was arrested three hours later after police found physical evidence and obtained a statement from her young son contradicting her story, a police report says.

Grigsby, 26, was booked with aggravated battery by shooting after wounding 20-year-old Courtney Vanderhorst of Harvey with a gunshot to the shoulder. Police said the shooting occurred just after 4 p.m. in a hallway of The Marquis Apartments at 2651 Poydras St.

The wounded man's aunt, who asked that her name be withheld, said her nephew had just arrived at the complex for a holiday visit when he mistakenly got off on the wrong floor of her building. She said Vanderhorst knocked on the door of an apartment that was one floor beneath hers and started to enter when the door opened before realizing his mistake.

"He said he stopped and stepped back when he realized it was the wrong house, and she shot him," the aunt said. "I don't think it was intentional that he was trying to force his way into her house or nothing. He was just on his way to visit me and it was an honest mistake.

"You can make a mistake if you're human. I've even went to the wrong house before."

The apartment building uses identical color schemes on every floor and four-digit apartment numbers. Only the second of the four digits differs from floor to floor.

The aunt said she does not know Grigsby well, but has spoken to her in passing while riding the elevator together with their children.

A police spokesman initially reported that an apparent intruder had been shot in the chest and was transported to Interim LSU Hospital in critical condition. An update about five hours later said he was in stable condition.

Vanderhorst's aunt said the wound as actually in the shoulder, and that he remained hospitalized Tuesday morning. Vanderhorst has not been arrested for his role in the incident.

"It was his shoulder, not his chest, thank God," she said. "He's fine, but he's not moving his arm right now."

Court records show no prior arrests for either Grigsby or Vanderhorst in Orleans or Jefferson parishes. The arrest report listed Grigsby as "sober" at the time of the shooting, with Vanderhorst's sobriety categorized as "unknown."

NOPD Detective Rodney Vicknair wrote in his report that Grigsby said she answered a knock at her door and opened it to find Vanderhorst trying to walk into her apartment. She told the man she didn't know him, ordered him to leave, and attempted to close the door, according to her account to investigators. She told police the stranger pushed her door open and entered her apartment, so she shot him in the right shoulder inside her residence.

The report said Vanderhorst told police he did push the door open, but only because he thought the woman did not belong in his family's apartment. He told police he did not enter the apartment and was shot while still standing in the hallway. The report said unspecified "visual evidence at the scene" corroborated his version of events.

The detective also asked Grigsby's permission to interview her 9-year-old son, who was home at the time. The boy told Vicknair that "his mom accidentally shot that man." He said his mother answered the door with a gun in her hand, told the man to leave, and shot him while he was outside the apartment.

The report said Grigsby was taken to an NOPD substation for a recorded interview, and maintained that she shot the stranger inside her apartment. When questioned about the conflicting statements by Vanderhorst and her son, she stopped cooperating with investigators and requested a lawyer.

Attorney Jerry Settle represented Grigsby at her hearing Tuesday morning, when her bond was set at $10,000. The next hearing in her case was set for Sept. 30.